# import sys
# file =sys.stdout
# file.write("hello world")
#
# print("hello world")
file =open ("test.txt", "rb")
print(file.read(1))
print(file.read(1))
print(file.tell())
print(file.seek(2,1))#1或2时 用“rb”

# with open("test.txt", "r",encoding='utf-8') as file2:
#     # for line in file2:
#     #     print(file2.readline())
#     #     print(file2.readline())
#     list2=file2.readlines()
#     print(list2)
# # print(file.read(3))
# str="day day up"
# with open ("test.txt", "w",encoding='utf-8') as file3:
#     file3.write(str)
#
# list3= ['hello001','world002']
# with open ("test.txt", "a",encoding='utf-8') as file4:
#     file4.writelines(list3)